Numerical investigation of simultaneous heat and mass transfer mechanisms occurring in a gypsum board exposed to fire conditions

Kontogeorgos, D; Founti, M

dc.contributor.author	Kontogeorgos, D	en
dc.contributor.author	Founti, M	en
dc.date.accessioned	2014-03-01T01:33:57Z
dc.date.available	2014-03-01T01:33:57Z
dc.date.issued	2010	en
dc.identifier.issn	1359-4311	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20631
dc.subject	Gypsum	en
dc.subject	Dehydration	en
dc.subject	Transient heat mass transfer	en
dc.subject	Porous materials	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	MOISTURE TRANSFER	en
dc.subject.other	BUILDING-MATERIALS	en
dc.subject.other	POROUS-MEDIA	en
dc.subject.other	CALCIUM-CARBONATE	en
dc.subject.other	HIGH-TEMPERATURES	en
dc.subject.other	COUPLED HEAT	en
dc.subject.other	PLASTERBOARD	en
dc.subject.other	WALLS	en
dc.subject.other	DECOMPOSITION	en
dc.subject.other	PERFORMANCE	en
dc.title	Numerical investigation of simultaneous heat and mass transfer mechanisms occurring in a gypsum board exposed to fire conditions	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.applthermaleng.2010.03.006	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.applthermaleng.2010.03.006	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	This paper investigates the simultaneous heat and mass transfer mechanisms occurring in a gypsum board exposed to fire conditions. An in-house developed code (HETRAN), simulating heat and mass transfer in porous building materials, has been used to predict the heat and mass transfer characteristics within gypsum boards. The code solves numerically a set of mass and energy equations appropriate for the heat and mass transfer in porous materials, assuming homogeneity, local thermodynamic equilibrium and mass transfer due to diffusion and pressure gradients. The predicted temperature evolution within the gypsum sample, with and without mass transfer, is compared to experimental data, demonstrating that vapor migration through the sample holds a significant role in the board behavior under elevated temperatures. The results demonstrate that vapor migrates towards both directions of the board (fire and ambient side), with diffusion mass transfer being the dominant mass transfer mechanism, whereas air moves towards the "fire side". The dehydration front moves from the "fire side" to the ambient side, with a high velocity in the beginning, which reduces as the front moves through the gypsum sample to the ambient side. (C) 2010 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	APPLIED THERMAL ENGINEERING	en
dc.identifier.doi	10.1016/j.applthermaleng.2010.03.006	en
dc.identifier.isi	ISI:000278675300021	en
dc.identifier.volume	30	en
dc.identifier.issue	11-12	en
dc.identifier.spage	1461	en
dc.identifier.epage	1469	en